यदि \(g\circ f\) एकैकी है, तो निश्चित रूप से कौन-सा निष्कर्ष सही है?
If \(g\circ f\) is one-one, which conclusion is definitely correct?
Explanation opens after your attempt
A. \(f\) एकैकी है(f) is one-one
Concept
मान लें (f(a)=f(b))। / Suppose (f(a)=f(b)).
Why this answer is correct
तब (g(f(a))=g(f(b))), यानी (\(g\circ f\)(a)=\(g\circ f\)(b))। \(g\circ f\) एकैकी है, इसलिए (a=b)। / Then (g(f(a))=g(f(b))), so (\(g\circ f\)(a)=\(g\circ f\)(b)). Since \(g\circ f\) is one-one, (a=b).
Exam Tip
संयोजन वाले प्रश्नों में परिभाषा को सीधे लागू करें। / In composition questions, apply the definition directly.
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